| --- Log opened Wed Jun 15 00:00:07 2016 | ||
| --- Day changed Wed Jun 15 2016 | ||
| sipa | ah | 00:00 |
|---|---|---|
| rusty | gmaxwell: That sounds like him being overly optimistic about how fast bitcoin moves, yeah. | 00:00 |
| sipa | was bitcoin-ng ever implememted? | 00:01 |
| gmaxwell | I don't know. They presented simulation results, they have not published code. We could ask Ittay. | 00:05 |
| gmaxwell | man, I didn't notice this before but their freeking bitcoin-ng announcment has this kind of junk in it. | 00:05 |
| gmaxwell | --- | 00:06 |
| gmaxwell | In Context | 00:06 |
| gmaxwell | Since the Bitcoin world is rife with conflicts of interest, there is value in reproducing part of the announcement that accompanied this note on the bitcoin developers list: | 00:06 |
| gmaxwell | NG is compatible with both Bitcoin as is, as well as Blockstream-like sidechains, and we currently are not planning to compete commercially with either technology -- we see NG as being complementary to both efforts. This is pure science, published and shared with the community to advance the state of blockchains and to help them reach throughputs and latencies required of cutting edge fintech app | 00:06 |
| gmaxwell | lications. Perhaps it can be adopted, or perhaps it can provide the spark of inspiration for someone else to come up with even better solutions. | 00:06 |
| gmaxwell | --- | 00:06 |
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| Taek | It was a breath of fresh air to go to the decentralized web summit. The attitude was a lot more collaborative, to the point I hadn't realized how difficult things were at Bitcoin conferences. | 00:42 |
| Taek | It's helps a lot that most of the tech there didn't rely on consensus, different implementations could coexist a lot easier than they can within the bitcoin ecosystem | 00:43 |
| qpm | tx:<Jeremy_Rand> Taek: it was my first time at a conference representing Namecoin. I also enjoyed it a lot. I'm a bit sad to hear you say that most Bitcoin conferences aren't as collaborative; that's unfortunate. | 00:44 |
| Taek | My first conference was after the blocksize rift happened, I can't speak to the environments before that | 00:45 |
| gmaxwell | before the scaling conferences there was very little in the way of bitcoin conferences with significant technical content. | 00:46 |
| qpm | tx:<Jeremy_Rand> Taek: ah, I see. Yeah, I have to admit I'm enjoying the fact that Namecoin doesn't have any equivalent controversy going on. I don't know how the Bitcoin people can handle the craziness. Hats off to everyone who's still getting productive work done. | 00:47 |
| Taek | I think most of the tension, even in the technical half of the community, is rooted around investments that people have made into Bitcoin. When half of your savings are invested into an asset, it puts you on edge to see things you feel might threaten the project | 00:48 |
| Taek | gmaxwell: were there moments at Wikipedia that parallel the blocksize debates? | 00:49 |
| qpm | tx:<Jeremy_Rand> Taek: that is a good point. And might also explain why Namecoin seems to be unaffected so far -- none of the Namecoin developers have a large investment in NMC. | 00:50 |
| qpm | tx:<Jeremy_Rand> (well, and also the fact that NMC's market cap is too small for anyone to care) | 00:50 |
| gmaxwell | Taek: there has been drama in many project's I've seen (also none in others)-- each case is pretty different. | 00:51 |
| qpm | tx:<Jeremy_Rand> My sample size is really small, but cryptocurrency projects have the most drama of any projects I've been even loosely involved in. | 00:52 |
| Taek | I seem to remember that some pretty terrible things happened with ffmpeg/libav | 00:53 |
| gmaxwell | yes, well... thats to say the least. | 00:53 |
| gmaxwell | Bitcoin drama is exacerbated by the Yahoo Stock Forums factor. If in 2001 you asked me where the most toxic place on the internet was, I'd have easily answered the yahoo stock trading forums. | 00:54 |
| gmaxwell | Seems like a unique mixture of the kind of personalities who are not just investing, but so opinionated about it that they want to argue with each other, with their positions backed up by large bets, and perhaps even the hope that their trolling will influence the price... | 00:54 |
| gmaxwell | Bitcoin picks up some of that. | 00:55 |
| gmaxwell | Another factor is that bitcoin is an awful big tent-- drawing in people from all kinds of perspective, a necessary thing for a money to do-- means that there is a less of a common basis to discuss things from. | 00:55 |
| Taek | 2001 was after the collapse of the dot-com bubble. Did that play into it? A lot of leftover tension from failed investments. | 00:56 |
| fluffypony | libertards are gonna libertard. | 00:56 |
| gmaxwell | It was also toxic before, actually I think the upswings mostly made it worse. | 00:56 |
| fluffypony | and capitalists are gonna capitalist, I guess | 00:56 |
| gmaxwell | There were some pretty big disputes between wikipedians early on, but they usually shared a lot more common basis than random bitcoin people will. | 00:56 |
| gmaxwell | Similar to disputes in standards orgs. | 00:57 |
| fluffypony | I think that the situation is exacerbated by a lack of technical understanding among most of the participants | 00:57 |
| gmaxwell | In WP but unlike my expirence in standards orgs, a lot of the "dispute" incidents were driven by clear outsiders. Like when scientology started a major campaign against wikipedia. This ultimately increased community cohesion, defending against a common threat. | 00:57 |
| Taek | Makes sense that diverse backgrounds would increase strife | 00:58 |
| fluffypony | so you end up with people feeling like something makes "more" sense to them, without an understanding of the technical complexities / perverse incentives / attack vectors involved | 00:58 |
| qpm | tx:<Jeremy_Rand> As a privacy-interested dev who basically ended up in cryptocurrency dev by accident, I have to admit that it was kind of jarring seeing the bad behavior that shows up in cryptocurrency circles, whether it's caused by money being involved or just a wider tent than I'm used to | 00:58 |
| fluffypony | Jeremy_Rand: it's the money thing | 00:59 |
| gmaxwell | In SDOs there are sometimes the concern that people are trying to undermine efforts of competing technology, but in those places they have anti-sockpuppetry measures that mean that the allegiences are clear. Trust in Bitcoin gets unmined somewhat for lack of that. (like, is this dude arguing with me in good faith, or is he just trying to promote some altcoin he's invested in?) | 00:59 |
| Taek | I wonder what sort of external threat to Bitcoin would be big enough to draw everyone together but small enough to leave the project intact. | 00:59 |
| fluffypony | never seen anything like this in FOSS projects, even ones that were poisonous and had an idiot savant leader | 00:59 |
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| gmaxwell | Most of the time people who don't like the technical stuff ignore the technical stuff.. and all are happy. But I think the Yahoo Stock Factor makes everyone opinioned about everything. :) | 01:00 |
| gmaxwell | Falkvinge's comments on reddit the last couple days are an interesting example. Super opinionated that segwit is totally unneeded and that malleaiblity will somehow fix itself by the wisdom of crowds. | 01:01 |
| fluffypony | oh the other thing is that technical criticisms are easily handwaved with accusations of "FUD" | 01:01 |
| Taek | You necessarily think about it more, which gives you more confidence in your opinion, making you less likely to realize that the guy across from you has 5 years of expert experience on you. | 01:02 |
| Taek | *Yahoo Stock Factor | 01:02 |
| gmaxwell | This is the beer-cup-hat factor that I lamented in that post, which a lot of people didn't like, and found to be unduly insulting; but I think it captures one element of things that go on. | 01:02 |
| gmaxwell | we also have pressure to express no doubt, actually--- this is perhaps one of the good things about the blocksize-saga. | 01:02 |
| gmaxwell | Some of the most vicious people in the community that would tolerate no technical person discussin a risk in bitcoin technology ended up on the must-hardfork-now side and themselves have been blah blah blah about risks from not hardforking for months. (Cypherdoc, being a good example of that). So perhaps in the future when someone talks about some risk that crew will be less likely to come out o | 01:04 |
| gmaxwell | f the woodwork with pointed sticks. | 01:04 |
| qpm | tx:<Jeremy_Rand> Taek: btw, I don't recognize your username -- sorry if this is a stupid question, but did we meet in person at the Decentralized Web Summit? (Trying to jog my memory.) | 01:04 |
| Taek | David Vorick, Sia, we may have conversed briefly, there were a lot of new faces and I didn't get to everyone | 01:05 |
| qpm | tx:<Jeremy_Rand> Taek: ok cool -- I'm pretty sure that if we talked, it was very brief. Same here, it was impossible to talk to everyone, despite my attempts to do so. :) | 01:06 |
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| midnightmagic | sipa: sorry. I forgot to ask permission in here while I was in #freenet asking. | 02:01 |
| midnightmagic | qpm is a relay bot between a Tor-only IRC network I built, and here. It's in a number of channels; given that I am 100% pro the insta kickban of a misbehaving remote nework (and given only a small handful of people are even using it right now) does anyone have any objections to qpm sitting here doing two-way relay? | 02:02 |
| midnightmagic | (or just +q I suppose) | 02:03 |
| midnightmagic | I am also oper over there: so problem users can be dealt with. Currently I don't expect issues because it's invite-only. But they're pretty regular users. | 02:03 |
| midnightmagic | I run qpm as well. | 02:04 |
| gmaxwell | thanks for creating that, I'm really disappointed with freenode's poor handling of tor. | 02:07 |
| midnightmagic | You're welcome to use it, aside from the inevitable netsplits it's been fairly reliable. Plus there's me, and I have not much else to do aside from respond to outages | 02:11 |
| midnightmagic | I'd say.. what, Jaremy? Maybe 98% at this point? | 02:12 |
| midnightmagic | oh, except for those days. | 02:12 |
| midnightmagic | Anyway if anyone can think of any objections, please let me know. I don't want to cause any problems. | 02:13 |
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| fluffypony | midnightmagic: same reason we have MRL-Relay routing to a private network, as gmaxwell indicates there's not much of an alternative right now | 02:23 |
| midnightmagic | true enough. | 02:25 |
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| gmaxwell | unfortunately it seems that bitcoin-otc was a major driver in freenode policy--- they stopped allowing tor because of nickserv brute forcing. | 02:29 |
| midnightmagic | we were, apparently hated and tolerated in about 50% portions. | 02:31 |
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| fluffypony | midnightmagic: so like Bitcoin, then :-P | 03:13 |
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| totemizer | obviously in the wizards channel there are more people than in the marketing channel... | 04:50 |
| totemizer | can anyone from here give me some links to blockchain related benchmarks? I depleted google and several other sources but there are only a really few I could find, maybe I am missing something | 04:51 |
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| murch | totemizer: What properties are you trying to find statistics on? It might be helpful to ask on http://bitcoin.stackexchange.com | 04:59 |
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| totemizer | thanks for the suggestion | 05:07 |
| totemizer | i am mostly interested in technical stuff, performance related things, anything to put a number on it really | 05:08 |
| totemizer | I came here instead of stackexchange because I haven't had a concrete question to put it there | 05:08 |
| sipa | perfoance of what? | 05:08 |
| sipa | blockchains are easy, maintaining a ledger is not | 05:09 |
| totemizer | performance of a blockchain, but it seems our terminology doesn't match up. i think of blockchain as a distributed database | 05:10 |
| sipa | it's not | 05:10 |
| sipa | a blockchain is a transaction log | 05:11 |
| sipa | it defines a database by replaying it | 05:11 |
| totemizer | right, so as I said our terminology doesn't match up, I hope this doesn't get into the way of communicating effectively | 05:12 |
| sipa | well it would help to clarify what you want to know about | 05:12 |
| sipa | "distributed database" is pretty vague | 05:12 |
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| fluffypony | totemizer: also "blockchain" is not generic | 05:14 |
| totemizer | sipa that is only because the words mean different things to you. I to me the core concept I care about is that the nodes are equals and there is no predetermined center to rely on, and that it stores data. | 05:14 |
| totemizer | fluffypony: what do you mean by generic? | 05:15 |
| fluffypony | totemizer: the performance benchmarks would differ across varying implementations of the same cryptocurrency, much less across different blockchain applications | 05:15 |
| fluffypony | eg. compare Bitcoin's performance on bdb vs. leveldb | 05:15 |
| sipa | yes, actual implementations use an actual local database | 05:15 |
| totemizer | fluffypony: I realize that the performance benchmarks would differ a lot, that is why I expected to find a lot of them, not a few... | 05:16 |
| totemizer | yeah, i do not meant "node performance" obviously | 05:16 |
| sipa | totemizer: what kind of benchmark do you mean? for what kind of operation? | 05:16 |
| sipa | "database updates per second" ? | 05:16 |
| totemizer | i meant "network performance". I was expecting stuff like "using this kind of consensus algorithm, this kind of implementation, etc etc etc technical details, these are the numbers..." | 05:17 |
| totemizer | it seems that there is no one doing this | 05:17 |
| totemizer | is this not something meaningful to do? | 05:17 |
| sipa | it is not without specifying what you mean by blockchain | 05:18 |
| sipa | if you're referring to a proof-of-work consensus algorithm, that pretty much only makes sense in case there is a financial incentive to cooperate | 05:18 |
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| sipa | and its performance depends on what the participants' nodes can tolerate | 05:19 |
| sipa | plus the inequality you're willing to live between between worse and better connected nodes | 05:19 |
| fluffypony | yeah so Bitcoin could "scale" to thousands of transactions per second | 05:19 |
| fluffypony | as long as each node was in a datacenter and had tons of highly performant hardware + lots of low-latency bandwidth between them | 05:19 |
| sipa | right, it depends on what the nodes and the connections between them can do | 05:20 |
| sipa | not on the kind of "blockchain" used | 05:20 |
| totemizer | sipa: I am not sure how else to specify it differently than what I already wrote: core concept I care about is that the nodes are equals and there is no predetermined center to rely on, and that it stores data. | 05:20 |
| sipa | well you can't use proof of work for that, as there is no incentive to cooperate | 05:21 |
| sipa | nodes don't lose anything by working adverserially | 05:21 |
| sipa | you can use a traditional consensus algorithm like paxos or pbft for that | 05:21 |
| sipa | if the nodes have known identities | 05:22 |
| sipa | in which case "blockchain" is just a new hyped name for something 20 year old | 05:22 |
| sipa | (for example, google uses paxos based distributed databases internally, with very high performance, and they don't have any fixed center) | 05:23 |
| totemizer | sipa: I see. I think that when asking about technical performance benchmarks I can ignore the theoretical part about incentives and malicious nodes and just ask what is the case in the optimal situation, as most benchmarks do that anyway. | 05:23 |
| fluffypony | totemizer: the problem is in defining "optimal" | 05:23 |
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| sipa | totemizer: if you only care about the optimal situation, you don't need a blockchain, use paxos | 05:23 |
| totemizer | optimal in this case is that no nodes try to act adverserially and every node does the same thing | 05:23 |
| sipa | use paxos | 05:24 |
| totemizer | sipa: paxos? | 05:24 |
| sipa | google it | 05:24 |
| totemizer | oh, i did, i am learning, thanks | 05:24 |
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| sipa | if nobody will act adverserially, you don't need a blockchain at all | 05:24 |
| fluffypony | blockchains are expensive and horribly inefficient, but for a reason | 05:25 |
| totemizer | sipa: ok, so for you blockchain has no meaning unless there are malicious nodes? | 05:25 |
| sipa | totemizer: to me, it is a data structure | 05:25 |
| totemizer | fluffypony: i know that, but thanks for pointing it out | 05:25 |
| totemizer | sipa: same with me, but i can only hear about the worst case scenarios | 05:25 |
| sipa | totemizer: but using it to define a distributed database only makes sense to establish consensus between distrusting partoes | 05:26 |
| murch | I've been trying to find that blog from a bitcoin startup that detailed various cases when companies tried to hire them. There was a nice overview of what else you should be using and why each of these cases didn't fit the blockchain use-case. Can't find it though. Does that ring a bell for one of you? | 05:26 |
| sipa | where you have the distinction between the case where the parties are known (use pbft) or are unknown and you'll use economic properties instead (proof of work) | 05:26 |
| totemizer | sipa: i am still with you, distrusting doesn't mean malicious though | 05:27 |
| sipa | totemizer: well in bitcoin parties assume that every single party can be malicious | 05:27 |
| murch | totemizer: Well, if the other won't act maliciously, why would you distrust them? o.0 | 05:27 |
| sipa | totemizer: if yiu assume none will be malicious, you have no reason to distrist | 05:28 |
| totemizer | so the system does consider it, but i want to know what is happening when there are no "active" nodes like that :) | 05:28 |
| sipa | sorry for typing | 05:28 |
| murch | ah found it! | 05:28 |
| murch | http://www.multichain.com/blog/2015/11/avoiding-pointless-blockchain-project/ | 05:28 |
| sipa | totemizer: sure, you can talk about a system where the system can deal with malicious parties, but you're talkong about benchmarks where none (or only a small number) are | 05:29 |
| murch | totemizer: Perhaps you have a look at that and you'll probably better understand why you're getting the answer you're getting here. | 05:29 |
| totemizer | sipa, murch it is a false dichotomy. it is completely possible to imagine a situation where you have a blockchain built with no trust in mind between the nodes but between time A and time B no active nodes act maliciously. theoretically this is possible i think | 05:29 |
| sipa | totemizer: no, i'm absolutely with you | 05:29 |
| sipa | totemizer: in fact, that is common | 05:29 |
| totemizer | i read that blogpost last week, but thanks :) | 05:30 |
| sipa | if the system is designed to deal well with malicious parties, it is likely that none will actually act maliciously, as there is nothing to gain | 05:30 |
| totemizer | sipa: ok, so what am I missing still? | 05:30 |
| totemizer | sipa: yeah, that was my thoughts too | 05:30 |
| sipa | totemizer: bottom line: if you want a blockchain to define a database where parties don't trust each other, performance is limited by what the weakest participant in the system can validate | 05:31 |
| totemizer | yay, thanks | 05:31 |
| sipa | because blockchains solve the trust problem in the absolutely most naive way possible: everyone validates everything | 05:31 |
| totemizer | yeah, you see, now you telling it, i find it logical, but i am just learning still so it was not obvious before if there is no other factor even more restraining | 05:32 |
| totemizer | i can imagine for example exactly PoW to be limiting of course :) | 05:32 |
| fluffypony | totemizer: also to add, the block size limit artificially limits the performance so that the weakest participant isn't cut off | 05:33 |
| totemizer | yeah, that is a fun thing with bitcoin | 05:33 |
| sipa | if you don't need that, and are willing to trust that all faults will be only due to race conditions and lost/slow communication, but not actively malicious parties, use paxos | 05:33 |
| totemizer | what do you think segregated witness will be adopted? | 05:33 |
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| sipa | i will quit if it doesn't :) | 05:34 |
| totemizer | i am reading up on paxos for sure, really good that you pointed it out, it was in my blindspot | 05:34 |
| totemizer | sipa: i wanted to ask "when", sorry | 05:34 |
| sipa | no clue | 05:34 |
| totemizer | like in a year? | 05:34 |
| sipa | i hope much faster | 05:34 |
| totemizer | be optimist for a second | 05:34 |
| totemizer | ok :D | 05:34 |
| fluffypony | totemizer: https://bitcoincore.org/en/segwit_adoption/ | 05:34 |
| totemizer | read that too, but i like asking other people :D | 05:35 |
| sipa | well, i'm biased | 05:35 |
| fluffypony | I think that's more a #bitcoin-dev question | 05:35 |
| murch | fluffypony: Not updated since 6th of May. ;) | 05:35 |
| murch | I hope it's not up-to-date because then none of those listed finished integrating support since then. | 05:36 |
| fluffypony | oh lol, didn't even notice that | 05:36 |
| murch | fluffypony: Well, at least nobody has posted on the corresponding github issue since 6th of May. | 05:36 |
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| totemizer | yeah, there are two pull requests and there is a comment on some change being needed but it is so ezoteric that I have no idea what it is about ÉD | 05:39 |
| sipa | the ml discussion about extending the size of witness programs? | 05:40 |
| instagibbs | murch, yes, it needs to get updated, but volunteer effort :P | 05:42 |
| totemizer | sipa: I don't think so | 05:45 |
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| murch | instagibbs: I don't mean to diss anyone's effort, I'm just trying to point out that the site is likely not representing the current stage of SegWit progress accurately. :) | 05:50 |
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| bsm117532 | gmaxwell: Re: bitcoin-ng I like the idea in principle, but it's a merging of two disparate technologies. I'd prefer to see Bitcoin stick with Nakamoto-style consensus rather than make a hybrid. That's what I'm trying to do with my braids project. | 06:11 |
| fluffypony | bsm117532: last sentence is a bit ambiguous - do you mean you're trying to stick with Nakamoto-style consensus with braids, or make a hybrid with braids? | 06:12 |
| bsm117532 | I've been concerned for some time that academia in general doesn't have the patience to shepherd such a change through the process of getting it into core. I've seen zero efforts (post announcement and paper) to get shepherd it (or several other academic projects). | 06:12 |
| bsm117532 | It's time consuming to build a testnet, shepherd patches/PR's, and the incentive structure in academia is to get the paper, not do the subsequent shepherding. | 06:13 |
| bsm117532 | With OSS projects there's always this nasty expectation that someone else will do the work for you... :-/ | 06:13 |
| bsm117532 | fluffypony: I'm sticking to Nakamoto-style consensus. That is, leaderless, and not identifying nodes (which pulls in BFT considerations). | 06:14 |
| bsm117532 | Personally I'm seriously wondering how I'm going have the time to shepherd my own ideas...but you won't find me bitching that Blockstream isn't doing it for me... ;-) | 06:16 |
| totemizer | bsm117532: but where are the papers then though? | 06:18 |
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| sipa | https://pbs.twimg.com/media/Ck-6wDGXEAA3zq4.jpg | 06:20 |
| totemizer | :D | 06:21 |
| totemizer | i read the lightning network paper, or at least part of it. I don't have an academic training so maybe I shouldn't say this, but I find it really convoluted compared to the actual content | 06:22 |
| fluffypony | totemizer: read Rusty's write-up on it, it's a lot easier to digest | 06:22 |
| totemizer | link pls | 06:22 |
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| fluffypony | http://rusty.ozlabs.org/?p=450 | 06:24 |
| fluffypony | http://rusty.ozlabs.org/?p=462 | 06:24 |
| fluffypony | http://rusty.ozlabs.org/?p=467 | 06:24 |
| fluffypony | http://rusty.ozlabs.org/?p=477 | 06:24 |
| fluffypony | there | 06:24 |
| totemizer | i just found it too, thank you ! :) | 06:24 |
| fluffypony | bbiab, have to go buy a new stepladder | 06:25 |
| instagibbs | bsm117532, what you said about shepherding is spot-on. Write the code, make an NG testnet, get feedback, etc. | 06:35 |
| bsm117532 | totemizer: I'm giving a talk about braids next week. Paper will follow shortly thereafter. The ideas are basically done, it's time to build a braided testnet. | 06:42 |
| bsm117532 | I know I know, I've been talking about this for a long time. ;-) | 06:43 |
| bsm117532 | It's really almost done this time, I promise! ;-) | 06:44 |
| sipa | the ideas for segwit were done in november :) | 06:45 |
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| totemizer | ideas are always done :D | 06:46 |
| totemizer | i can give zillion ideas that are done | 06:47 |
| bsm117532 | I had to do quite some numeric analysis for this one. ;-) | 06:47 |
| bsm117532 | Grahps can be complex. | 06:47 |
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| totemizer | bsm117532: well, i hope your paper will not be behind a paywall then and I am curious of those graphs :D | 06:53 |
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| bsm117532 | Of course not!!! It will be on arxiv.org and then in Ledger. Relevant code is on github already if you want to play around. https://rawgit.com/mcelrath/braidcoin/master/Braid%2BExamples.html | 06:54 |
| bsm117532 | https://github.com/mcelrath/braidcoin | 06:54 |
| bsm117532 | One major addition is still coming: merging of forks. | 06:54 |
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| bsm117532 | braids : bitcoin :: git : subversion | 06:55 |
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| totemizer | Ledger? | 06:55 |
| * totemizer is really not sync with the terminology here | 06:55 | |
| instagibbs | Ledger Journal, not Ledger the hardware company, or LedgerX, the crypto clearing house | 06:55 |
| bsm117532 | http://ledgerjournal.org/ | 06:56 |
| totemizer | oh, i was missing out | 06:56 |
| totemizer | thanks | 06:56 |
| totemizer | so annoying that for 2 weeks i am googling "blockchain" every day but this site never popped up | 06:56 |
| bsm117532 | See, blockchain isn't a thing. Banks wish it was though, so they keep saying it. | 06:58 |
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| totemizer | it is a thing, it is a datastructure | 07:12 |
| totemizer | it's just not what they think of when they say blockchain | 07:12 |
| totemizer | basically they do not want to say "bitcoin" | 07:12 |
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| maaku | a blockchain is literally nothing more than a singly linked list, one of the oldest data structures in computer science :( | 13:05 |
| fluffypony | maaku: he's no longer in channel, unfortunately | 13:08 |
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| bsm1175321 | let's make Bitcoin great again! | 13:08 |
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| fluffypony | bsm1175321: *grate | 13:09 |
| * fluffypony grabs the block of cheese | 13:09 | |
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| bramc | Hey everybody | 14:35 |
| kanzure | bramc: what's up | 14:37 |
| bramc | kanzure: I made a lengthy post to bitcoin-dev. Now I need to actually finish my data structure. | 14:38 |
| kanzure | https://lists.linuxfoundation.org/pipermail/bitcoin-dev/2016-June/012758.html | 14:39 |
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| bsm1175321 | bramc: do you have some numbers on how long it takes to compute the commitment? | 14:55 |
| bsm1175321 | I'm still confused by why this is so slow.. :-/ | 14:55 |
| bramc | bsm1175321: The problem is memory cache misses are extremely slow https://en.wikipedia.org/wiki/CPU_cache | 14:57 |
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| bramc | Basically if you access a distant part of memory you haven't hit in a while it will have to be swapped in, and everything will have to sit around waiting for the shipment to come in. | 14:58 |
| bsm1175321 | I mean, once the set is computed, we're talking about adding/removing a few thousand elements, on average, no? | 14:58 |
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| bsm1175321 | I'm well aware, but even including that, I'm surprised. | 14:59 |
| bramc | Yes that's correct, it requires enough recomputation of the while utxo set to be dicey though. Just roots of those few thousand transactions are no big deal. | 14:59 |
| bramc | Also you want delays hitting block propagation to be really, really low. And naive merkle tree implementations are really, really bad. | 15:00 |
| bramc | My argument is roughly along the lines of what you're saying though - my thesis is that the performance problems can be gotten under control using a good implementation and don't need any fancy MMR stuff | 15:01 |
| bsm1175321 | So, in some of the braids work I'm doing, I moved from tree-based sets to hash-based sets, which generally gives orders of magnitude improvement in speed. Is there a reason a hash-and-bucket set implementation wouldn't work here? | 15:01 |
| bramc | Yes, you need to compute a merkle root. | 15:01 |
| bsm1175321 | Ooooh yeah. | 15:01 |
| bsm1175321 | fart. | 15:01 |
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| bsm1175321 | Couldn't the hash-and-bucket structure itself be encoded, instead of a merkle tree root? | 15:02 |
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| bramc | You generally want to avoid using a merkle set even when you have one and it's highly performant. A parallel regular set will always kick its ass in performance. | 15:02 |
| bsm1175321 | I mean, to first order the txids are already hashes, so one could use the first few bytes of that as your first try. | 15:03 |
| bramc | My implementation uses balanced prearranged things with that sort of technique. It's orthogonal to whether the underlying merkle set is binary. There's no benefit to going non-binary or unbalanced. | 15:03 |
| bsm1175321 | Then you just need to encode the buckets with multiple elements... | 15:03 |
| bramc | My documentation at the top of the file which explains the data format is fully fleshed out by the way, I can explain the details. | 15:04 |
| bsm1175321 | So then am I correct that a c++ unordered_set<> would be superior, all we need is a way to compute a commitment of one? | 15:05 |
| bramc | Yes a regular hash set is clearly better. I think I can get performance within an order of magnitude though. | 15:07 |
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| bsm1175321 | A concrete comparison would definitely be worthwhile, before accepting delayed commitments, for example. | 15:10 |
| bsm1175321 | (FWIW, I have a use for these commitments -- and I'd like them to be timely!) | 15:10 |
| bramc | Yes everybody wants a performant merkle set implementation. It's a useful toy for all kinds of stuff. | 15:12 |
| bramc | I need to get my implementation finished. Nobody else is volunteering to do one, and I don't blame them. | 15:12 |
| bsm1175321 | I've found unordered_set to be sufficient for my purposes... :-/ | 15:13 |
| bramc | The really meaningful comparison is how quickly you can do a simple lookup in a regular set versus a lookup with a proof in a merkle set | 15:14 |
| bramc | Doing boolean membership lookups in a merkle set is just dumb. | 15:14 |
| bsm1175321 | bramc: given the entire set in memory, stored as a regular set (with insertions/deletions from a new block), how much time is it to compute the Merkle root from scratch? You wouldn't have a cache miss problem there. | 15:20 |
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| bsm1175321 | The Merkle roots of sub-trees could be cached and invalidated when their contents modified accessed, so you know which sub-trees need to be recomputed, where the size of a sub-tree is set to the CPU cache size... | 15:25 |
| bsm1175321 | s/accessed// | 15:27 |
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| bramc | In my implementation the merkle root is calculated lazily. If you add everything before asking for the root and then request the root it will mostly do a linear pass | 15:33 |
| bramc | It also clusters sub-trees together. That's what cache coherence is :-P | 15:34 |
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| bsm1175321 | bramc: You've got a few syntax errors in your master HEAD | 15:37 |
| bramc | bsm1175321: You mean like all the lines which are written in english and need to be translated into code? | 15:38 |
| bramc | When I said it isn't done yet, that was meant literally | 15:39 |
| bramc | That said, the explanation of the data format at the top should be final, as are all API methods (the ones which don't start with an underscore) | 15:40 |
| bramc | The _ref and _deref methods are ridiculous and should be eliminated completely on a port to C | 15:41 |
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| bsm1175321 | No I mean indentation and unmatched parens | 15:46 |
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| bramc | Eh probably, it isn't at all finished. I'm focusing on getting it all written before doing any debugging. | 15:51 |
| midnightmagic | Oh, hey bramc nice to see you again. | 15:53 |
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| bramc | Hey midnightmagic | 16:23 |
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| bsm117532 | I'm adding a networking delay to my braids project. I'm thinking to use a fat-tailed Cauchy distribution. Does anyone have a better suggestion for modeling Bitcoin's block propagation? | 19:58 |
| bsm117532 | Also, for the record, the Cauchy distribution is also known as the Lorentz distribution and Breit-Wigner distribution, and is how we discover new particles in physics! | 19:59 |
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| bsm117532 | Numerics I've run so far indicate a 4.8s median propagation time (measured from the orphan rate). | 20:00 |
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| maaku | bsm117532: you need more documentation about your braids project | 22:25 |
| gmaxwell | bsm117532: in bitcoin? unfortunately many orphans are dark | 22:28 |
| gmaxwell | mining equipment has rather high latency, often a block is orphaned by the time it is returned to its bitcoind | 22:28 |
| gmaxwell | those orphans never relay | 22:29 |
| gmaxwell | other ones might pass the first bitcoind but not make it far enough for you to observe them. | 22:29 |
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| --- Log closed Thu Jun 16 00:00:31 2016 | ||
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